ssh: Make the mode extension "x" portable by a call to es_fopen.

* agent/command-ssh.c (open_control_file): Use_es_fopen to support
the "wx" mode flag.

--

This also patch also specifies a file mode parameter.  However, this
will only be used with an updated version of es_stream which we have
not yet done.
ssh: Do not look for a card based ssh key if scdaemon is disabled.

* agent/command-ssh.c (ssh_handler_request_identities): Do not call
card_key_available if the scdaemon is disabled.
--

(back ported from commit id 781e9746dff21fc2721373205e63d1d09722d590)
ssh: Cleanup sshcontrol file access code.

* agent/command-ssh.c (SSH_CONTROL_FILE_NAME): New macro to replace
the direct use of the string.
(struct control_file_s, control_file_t): New.
(open_control_file, close_control_file): New.  Use them instead of
using fopen/fclose directly.
--

(cherry picked from commit 25fb53ab4ae7e1c098500229c776d29b82713a20)

Fixed conflicts in some variabale names.
ssh: Improve key lookup for many keys.

* agent/command-ssh.c: Remove dirent.h.
(control_file_s): Add struct item.
(rewind_control_file): New.
(search_control_file): Factor code out to ...
(read_control_file_item): New.
(ssh_handler_request_identities): Change to iterate over entries in
sshcontrol.
--

Formerly we scanned the private key directory for matches of entries
in sshcontrol.  This patch changes it to scan the sshcontrol file and
thus considers only keys configured there.  The rationale for this is
that it is common to have only a few ssh keys but many private keys.
Even if that assumption does not hold true, the scanning of the
sshcontrol file is faster than reading the directory and only then
scanning the ssh control for each directory entry.

(cherry picked from commit d2777f84be0ded5906a9bec3bc23cfed0a9be02f)
ssh: Rewrite a function for better maintainability

* agent/command-ssh.c (ssh_signature_encoder_dsa): Rewrite.
--

Using es_fopenmem instead of a preallocated buffer is safer and easier
to read.
(cherry picked from commit f76a0312c3794afd81fe1e172df15eb0612deae0)
estream: New function es_fclose_snatch.

* common/estream.c (cookie_ioctl_function_t): New type.
(es_fclose_snatch): New function.
(COOKIE_IOCTL_SNATCH_BUFFER): New constant.
(struct estream_internal): Add field FUNC_IOCTL.
(es_initialize): Clear FUNC_IOCTL.
(es_func_mem_ioctl): New function.
(es_fopenmem): Init FUNC_IOCTL.
--

(back ported from commit id 7737a2c269657189a583cde7f214f20871d264f8)

Signed-off-by: Werner Koch <wk@gnupg.org>
ssh: Support ECDSA keys.

* agent/command-ssh.c (SPEC_FLAG_IS_ECDSA): New.
(struct ssh_key_type_spec): Add fields CURVE_NAME and HASH_ALGO.
(ssh_key_types): Add types ecdsa-sha2-nistp{256,384,521}.
(ssh_signature_encoder_t): Add arg spec and adjust all callers.
(ssh_signature_encoder_ecdsa): New.
(sexp_key_construct, sexp_key_extract, ssh_receive_key)
(ssh_convert_key_to_blob): Support ecdsa.
(ssh_identifier_from_curve_name): New.
(ssh_send_key_public): Retrieve and pass the curve_name.
(key_secret_to_public): Ditto.
(data_sign): Add arg SPEC and change callers to pass it.
(ssh_handler_sign_request): Get the hash algo from SPEC.
* common/ssh-utils.c (get_fingerprint): Support ecdsa.

* agent/protect.c (protect_info): Add flag ECC_HACK.
(agent_protect): Allow the use of the "curve" parameter.
* agent/t-protect.c (test_agent_protect): Add a test case for ecdsa.

* agent/command-ssh.c (ssh_key_grip): Print a better error code.
--

The 3 standard curves are now supported in gpg-agent's ssh-agent
protocol implementation.  I tested this with all 3 curves and keys
generated by OpenSSH 5.9p1.

Using existing non-ssh generated keys will likely fail for now. To fix
this, the code should first undergo some more cleanup; then the fixes
are pretty straightforward.  And yes, the data structures are way too
complicated.

(cherry picked from commit 649b31c663b8674bc874b4ef283d714a13dc8cfe)

Solved conflicts:

	agent/protect.c
	agent/t-protect.c
        common/ssh-utils.c (different variabale name)
ssh: Mark unused arg.

* agent/command-ssh.c (ssh_signature_encoder_ecdsa): Cast spec to
void.
Update NEWS.

--
estream: Backport es_fopemem_init from master.

* common/estream.c (es_fopenmem_init): New.

Signed-off-by: Werner Koch <wk@gnupg.org>
Silence deprecated warnings from gcc 4.6.3.

* configure.ac (AH_BOTTOM): Define GCRYPT_NO_DEPRECATED.
--

Frankly, I don't understand why gcc prints them.  We don't use them.

Signed-off-by: Werner Koch <wk@gnupg.org>
agent: Fix binary vs. text mode problem in ssh.

* agent/command-ssh.c (file_to_buffer)
(ssh_handler_request_identities): Open streams in binary mode.
(start_command_handler_ssh): Factor some code out to ..
(setup_ssh_env): new function.
--

This is for now a theoretical fix because there is no ssh client yet
which uses the GnuPG style IPC.  OpenSSL for Cygwin uses only a quite
similar one.  gniibe suggested to implement that IPC style in
Libassuan so that a Cygwin version of OpenSSL may be used with GnuPG.

Signed-off-by: Werner Koch <wk@gnupg.org>
ssh: Add support for Putty.

* agent/gpg-agent.c [W32]: Include Several Windows header.
(opts): Change help text for enable-ssh-support.
(opts, main): Add option --enable-putty-support
(putty_support, PUTTY_IPC_MAGIC, PUTTY_IPC_MAXLEN): New for W32.
(agent_init_default_ctrl): Add and asssert call.
(putty_message_proc, putty_message_thread): New.
(handle_connections) [W32]: Start putty message thread.
* common/sysutils.c (w32_get_user_sid): New for W32 only
* tools/gpgconf-comp.c (gc_options_gpg_agent): Add
--enable-ssh-support and --enable-putty-support.  Make the
configuration group visible at basic level.
* agent/command-ssh.c (serve_mmapped_ssh_request): New for W32 only.
--

This patch enables support for Putty.  It has been tested with Putty
0.62 using an Unix created ssh key copied to the private-keys-v1.d
directory on Windows and with a manually crafted sshcontrol file.  It
also works with a smartcard key.

May thanks to gniibe who implemented a proxy in Python to test the
putty/gpg-agent communication.

Signed-off-by: Werner Koch <wk@gnupg.org>
Update the German translation.
po: Auto updates.

--
agent: Make --allow-mark-trusted the default.

* agent/gpg-agent.c (opts, main): Add option --no-allow-mark-trusted.
Put this option into the gpgconf-list.
(main): Enable opt.allow_mark_trusted by default.
* tools/gpgconf-comp.c (gc_options_gpg_agent): Replace
allow-mark-trusted by no-allow-mark-trusted.

* agent/trustlist.c (agent_marktrusted): Always set the "relax" flag.

--

These changes have been in effect for the Gpg4win Windows version
since 2011-01-24 and thus first released with Gpg4win 2.1.0.  Given
the current state of PKIX it does not make any sense to lure the Unix
user into false security by making it harder to trust self-signed or
CAcert certificates.

Signed-off-by: Werner Koch <wk@gnupg.org>
Update the German translation.
po: Auto updates.

--